netdev - Re: [PATCH net] net: dsa: mv88e6xxx: Reset mv88e6393x watchdog register

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Date:   Tue, 28 Mar 2023 16:47:42 +0200
From:   Marek Behún <marek.behun@....cz>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Gustav Ekelund <gustaek@...s.com>,
        Gustav Ekelund <gustav.ekelund@...s.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, kernel@...s.com,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net] net: dsa: mv88e6xxx: Reset mv88e6393x watchdog
 register

On Tue, Mar 28, 2023 at 03:45:51PM +0200, Andrew Lunn wrote:
> On Tue, Mar 28, 2023 at 03:34:03PM +0200, Gustav Ekelund wrote:
> 
> > 1) Marvell has confirmed that 6393x (Amethyst) differs from 6390 (Peridot)
> > with quote: “I tried this on my board and see G2 offset 0x1B index 12 bit 0
> > does not clear, I also tried doing a SWReset and the bit is still 1. I did
> > try the same on a Peridot board and it clears as advertised.”
> > 
> > 2) Marvell are not aware of any other stuck bits, but has confirmed that the
> > WD event bits are not cleared on SW reset which is indeed contradictory to
> > what the data sheet suggests.
> 
> Hi Gustav
> 
> Please expand the commit message with a summary of this
> information. It answers the questions both Marek and i have been
> asking, so deserves to be in the commit message.
> 
> 	Andrew

Maybe also add a comment next to the code writing to the register, that
this is due to an yet unreleased erratum on 6393x.

Marek